DayHooks is a compact trainer we built at Hardcode Studios for a mental calendar skill: working out the weekday of any date without opening a calendar. It teaches Odd+11 or Conway 12s, backs those methods with mnemonic hooks, and gives you a live coach sheet plus Drill and Lab modes so the habit sticks. The catalogue entry is on our tools page, and the live app is at /tools/dayhooks/.

The problem it solves

Most people reach for a calendar app when they need the weekday of a date. That is fine when a phone is already in hand. It is less useful when you are planning aloud, teaching, or trying to keep a date system in your head.

The skill itself is old: a short set of year methods, month and century anchors, and day mnemonics. What is usually missing is a calm place to practise. DayHooks is that place. It is a learning tool, not a calendar product.

What we built

The live app is organised around three modes: Learn, Drill and Lab. You pick a year method (Odd+11 or Conway 12s), choose how much coach help you want (Coach, Sheet or Off), and set a focus such as full date, days, months, leap years, century, or other drills the app lists. Year ranges on the public UI include 1980-2035, 1900-2099 and 1600-2299.

In Drill with Coach on, you see a date prompt ("What weekday?"), answer keys for Sunday to Saturday (0 to 6), Hint and Next controls, and a coach sidebar with mnemonic hooks. The public sheet shows day hooks (for example Noneday, Oneday, Twosday), leap and century blocks, and month hook groups such as the doubles and the "9 to 5 at 7-11" set. Keyboard shortcuts on the page footer cover answers, hint, a new date, next, and toggling the sheet.

Lab mode lets you try any date outside a scored drill. The tool page summarises the product as mnemonic hooks for any date's weekday, with Odd+11, a live sheet, drills and a lab. Tags on that page include Education, Browser and Practice. Availability is listed as an internal page, with an Open Dayhooks CTA into the live app.

How practice is meant to work

The loop is deliberately short:

  1. Choose Odd+11 or Conway 12s.
  2. Keep Coach or Sheet visible while the method is new.
  3. Answer with 0 to 6 (Sun to Sat), use Hint when stuck, then Next.
  4. Fade the coach help as the hooks settle.
  5. Use Lab when you want to inspect a specific date rather than take a random drill.

Nothing in the public product promises exam results, school partnerships or a fixed number of days to mastery. The session hit and streak counters you may see in the UI are practice feedback for that session, not marketing metrics.

Why this matters if you are weighing us up

DayHooks is a small education tool, but the build pattern is familiar from client work:

  • A clear skill, not a feature dump. The product is about weekday-of-date, not a general calendar suite.
  • Two named methods, one interface. Odd+11 and Conway 12s share the same drill shell, so learners can compare approaches without learning a new app.
  • Mnemonics as first-class UI. Hooks for days, months and centuries sit in the coach sheet where they are needed, not in a separate PDF.
  • Keyboard-friendly practice. Shortcuts match the drill, which matters when someone is repeating dates for ten minutes at a desk.
  • Shipped as a live browser tool. No install wall: open /tools/dayhooks/ and start a drill.

If your organisation trains people on procedures that need short, repeatable drills with a reference sheet beside the prompt, this is the same shape: prompt, answer, hint, next, and a coach panel that can be turned down over time.

Talk to us

If you want a practice tool, a learning interface, or a small browser app built around one skill, get in touch. Try DayHooks on the live app, read the catalogue notes on the tool page, or browse more Hardcode tools on /tools/.